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x in (-oo:+oo)
(-2/5)*x-(3/10) = (-1/3)*x-(13/30) // - (-1/3)*x-(13/30)
(-2/5)*x-((-1/3)*x)-(3/10)+13/30 = 0
(-2/5)*x+(1/3)*x-3/10+13/30 = 0
2/15-1/15*x = 0 // - 2/15
-1/15*x = -2/15 // : -1/15
x = -2/15/(-1/15)
x = 2
x = 2
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